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ceph: avoid putting the realm twice when decoding snaps fails

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[ Upstream commit 51884d153f7ec85e18d607b2467820a90e0f4359 ]

When decoding the snaps fails it maybe leaving the 'first_realm'
and 'realm' pointing to the same snaprealm memory. And then it'll
put it twice and could cause random use-after-free, BUG_ON, etc
issues.

Cc: stable@vger.kernel.org
Link: https://tracker.ceph.com/issues/57686
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Xiubo Li 2022-11-09 11:00:39 +08:00 • committed by Greg Kroah-Hartman
commit cb7495fe95
1 changed files with 2 additions and 1 deletions
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3
fs/ceph/snap.c
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@ -694,7 +694,7 @@ int ceph_update_snap_trace(struct ceph_mds_client *mdsc,
struct ceph_mds_snap_realm *ri; /* encoded */
__le64 *snaps; /* encoded */
__le64 *prior_parent_snaps; /* encoded */
struct ceph_snap_realm *realm = NULL;
struct ceph_snap_realm *realm;
struct ceph_snap_realm *first_realm = NULL;
struct ceph_snap_realm *realm_to_rebuild = NULL;
int rebuild_snapcs;
@ -705,6 +705,7 @@ int ceph_update_snap_trace(struct ceph_mds_client *mdsc,
dout("update_snap_trace deletion=%d\n", deletion);
more:
realm = NULL;
rebuild_snapcs = 0;
ceph_decode_need(&p, e, sizeof(*ri), bad);
ri = p;